Jump to content

sgl_imaging_challenge_2021_annual.thumb.jpg.3fc34f695a81b16210333189a3162ac7.jpg

Recommended Posts

Hello everyone , 

Does anyone know what focal length you get when you screw off the bottom 1.25 section of the Baader Hyperion 8mm ? Maybe somewhere between 14 and 18mm ? 

I got it yesterday included in the extras with a SW 80ED , along with a SW 2" super deluxe barlow and the 28mm 2" LER kit lens .

 

Edited by Red Dwarfer
Link to post
Share on other sites

I tried this once. I seemed to recall that I got something around 22mm with the bottom section removed. It was rather poorly corrected though so I didn't use it that way.

 

Link to post
Share on other sites
1 hour ago, MARS1960 said:

There is a spec sheet on RVO that might help, bottom of page.

http://www.rothervalleyoptics.co.uk/baader-hyperion-1252-modular-eyepiece.html

Many thanks for the link , the chart gives two results of 21.8 and 30.0 . I think the first one is the best answer . I was trying some terrestrial tests with the adjusted 21.8 Baader and 28mm LER on red berries in a hedgerow - the famous berry nebula ?

  • Like 1
Link to post
Share on other sites
12 minutes ago, John said:

I tried this once. I seemed to recall that I got something around 22mm with the bottom section removed. It was rather poorly corrected though so I didn't use it that way.

 

Thanks for the response . 22mm sounds about right and I did notice a barrelling ( if that is the right term ) effect to begin with but when I leaned right in it was gone . It's an interesting feature , but I'm not sure how keen users would be unscrewing lens elements in the dark ?

 

Link to post
Share on other sites

If you want to use the Baader Fine Tuning Rings then you have to unscrew the nose piece because the rings fit in between that and the main eyepiece body. The optics in the nose piece do more than just creating the focal length which is why the optical performance of the top section alone is not too good.

Baader's modular approach to their stuff does give you plenty of options to explore though :smiley:

  • Like 1
Link to post
Share on other sites

I know if you unscrew the bottom of a 2x barlow that you get something like 1.5x. Ive never heard of anyone doing the same with an EP to increase/decrease the magnification. Maybe i'm reading this thread the wrong way.

Link to post
Share on other sites
8 minutes ago, LukeSkywatcher said:

I know if you unscrew the bottom of a 2x barlow that you get something like 1.5x. Ive never heard of anyone doing the same with an EP to increase/decrease the magnification. Maybe i'm reading this thread the wrong way.

 

post-77946-0-98715100-1431401075.jpg

  • Like 1
Link to post
Share on other sites
2 hours ago, LukeSkywatcher said:

I know if you unscrew the bottom of a 2x barlow that you get something like 1.5x. Ive never heard of anyone doing the same with an EP to increase/decrease the magnification. Maybe i'm reading this thread the wrong way.

I`d never heard of them neither until yesterday . Baader seem to be the only brand to do this modular design as well :happy7:

Link to post
Share on other sites

Moving the position of the lens element of the barlow lens away from the eyepiece increases the amplification factor while reducing the separation, reduces it. There are quite a few brands of barlow that have removable lenes element sections but Baader seem to take the modular approach much further than most. Meade used to make a barlow with a sliding optical element so you could vary the amplification. Basically a zoom eyepiece works on this principle.

 

Edited by John
  • Like 1
  • Thanks 1
Link to post
Share on other sites

Then there are the Speer-Waler 5-8mm and 8-12mm "zooms".  They're more accurately described as varifocal.  I have the original 5-8mm version, and it is actually quite good.  Coupled with an 8-24mm zoom and a lowest power, widest field eyepiece, I'm pretty well set for compact travel.

There was also the Zoomset for inserting between the positive and negative parts of some eyepieces.

  • Like 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By SuburbanMak
      My objectives on getting a new Skymax 127 were purely visual observing having parked imaging for a far-off time when I have time on my hands but, on taking delivery of a Baader Hyperion 8-24mm Zoom and fixed Hyperion 24mm 68 degree, I noticed a photo on the box and was intrigued..
      My DSLR hardly gets an outing these days with an iPhone camera always on hand but I thought it has to be worth a go so I ordered a Baader M43-T2 thread ring and a Nikon T ring to connect it all together, perhaps this could be quick and dirty way of getting into basic imaging at low cost. It all connects incredibly simply in seconds and although I'm only using the supplied SW plastic-bodied diagonal feels nice and secure when its on the 'scope.
      It makes quite a chunky load on the little AZ GTi mount but with the Vixen bar at its extreme balance point the mount performs fine at what I reckon is the very top end of its published 5KG payload. 
      Initially I just wanted to establish if there's a decently bright and focusable image that makes it to the CCD & given the absence of stars due to current weather and this being a bit of an operation to put together, a daylight test seemed a good idea.  I have a very handy church spire about 500m away (about the maximum possible distance from a church in Winchester) and poking it all out of an upper storey window in failing light on an extremely windy Saturday I captured the orb below on a  2.5 s exposure - (distance view included for scale, the spire is centre frame partially in the trees). 
      Verdict: focussing is tricky, as you can see, but on the Skymax 127 there's definitely plenty of leeway either side with the focuser which answered my initial exam question, it just takes some focus to focus!
      I've ordered the Baader heavy duty quick release system pictured on the box which should make this much safer and more practical  in the dark and cold, although it does make this not quite the bargain-basement option it is with just the 2 rings.
      Given the light & time limitations of the test Id say its definitely worth trying on nighttime targets, if the clouds ever clear...
      Will post any results up here but this looks like a really promising way of resurrecting a Nikon D90 that has been on the dole for a while (it shoots RAW video too!)
      Any hints, tips or suitable targets appreciated!







    • By Mikkel
      Here's a question from a happy astro-amateur from Denmark.

      I currently own a Sky-Watcher Explorer 130/900 and I think about making a setup with that and my Olympus OMD E-M10 MKII for some astrophotography. The camera has a micro 4/3 lens mount. I have been using my scope for a couple of years though I'm very experienced but I am a complete novice when it comes to AP. 
      I've read good reviews of the Baader Hyperion eyepieces and think that a 21mm would be nice and it has M43 and T2 photo threads.
      So my questions are these:
      1. How do I fit the camera on the eyepiece (adapter or not)?
      2. Is the Baader Hyperion a good choice?
      3. What will fitting the eyepiece to the camera do to the focal length of the eyepiece (should I go with another focal length)?
       
      I know this is a lot and quite equipment specific, but hopefully someone has an opinion. :-) Thank you so much.

      Mikkel
    • By StarryEyed
      For sale and in perfect condition.
      Original box, paperwork, protective bag and end caps.
      £70 includes signed for postage.
      Now £60 without postage.
      I have some photos if your curious and can take any you may wish.
      Kevin.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.